I don’t really know how they named, but I want to speak of that. https://images.app.goo.gl/q7NRA46fvjgifJhy8
I think that this feature for our custom GUI may be very nice because with that we are able to to add configuration GUI to our mods.
For example, I have a custom item that when player right click on it, I spawn a number of mobs. In the custom GUI, I can put a “Scroll Bar” that go to 1 to 100 (The maximum number are able to change when creating it.). So, like the number is to 10 (Just for the example), 10 zombies (For the example) will be summon.
I hope to have be clear, and this feature may be very nice.
P-S : And just a question, the 1.9.1 is for Sunday, or in the week ?